城市信息化测绘的实验

对信息化测绘进行系统分析,对关键技术进行了论述并结合番中测区首次信息化测绘进行实践,对入库质量检查进行了重点论述。最后,针对本次信息化测绘进行了总结,提出了体会。     

浅谈中山市连续卫星定位服务系统的建设及应用

首先阐述了中山市对CORS的需求背景,主要对ZSCORS的建设进行了介绍,并对ZSCORS的原理和系统组成及功能进行了说明,最后对ZSCORS的应用特点进行了论述。     

浅谈低空无人机航摄试验

本文介绍了浙江省进行的低空无人机航摄试验,较为详细地描述了试验条件,对获取的无人机航摄影像进行的后处理技术与取得的相应的成果进行了说明,并对成果进行了分析评价。     

浅谈低空无人机航摄试验

本文介绍了浙江省进行的低空无人机航摄试验,较为详细地描述了试验条件,对获取的无人机航摄影像进行的后处理技术与取得的相应的成果进行了说明,并对成果进行了分析评价。     

江苏省水利地理信息服务平台资源注册系统的分析与设计

对江苏省水利地理信息服务平台资源注册系统的需求进行了分析,对系统的用户类型进行了划分,介绍了系统的用例,在此基础上对系统的设计进行了探讨。     

基于XML的字处理软件的设计、开发及其在电子政务中的应用

本文回顾了电子政务系统中字处理软件的地位和使用状况,并对电子政务系统中字处理软件的需求进行了分析;采用XML技术对字处理文档格式进行了分析和设计;基于这种文档格式自主开发了字处理软件,并对软件的架构特点进行了总结;最后,对该软件在某电子政务系统中的应用情况进行了介绍。     

Arc/Info Workstation在GIS数据处理中的应用

对近年来GIS调查类项目的数据采集、数据转换等方面进行了论述,特别是在AutodeskCAD上进行数据采集,在Arc/Info上进行数据关联和数据转换进行了讨论。     

模糊地理实体的表示及其性质的研究

对模糊地理实体的点实体、线实体和面实体的模糊性进行了研究,就它们的模糊表示进行了阐述。特别是就模糊面实体和确定的面实体进行对比,就二者的不同点进行了探讨,并给出了模糊面实体的实例,最后对本文进行了总结,得出了本文的研究只是一个探讨,还有很多问题需要解决。     

基于InSAR技术的地表三维形变获取方法综述

对近年来提出的基于InSAR技术的地表三维形变获取方法进行了综述,并对该技术的发展进行了展望。对一些重要的知识背景和理论方法进行了简单介绍,并针对每种方法列举典型案例,对其适用条件进行了简单总结,为相关领域的研究者提供了最新研究进展和技术参考。     

激光站在星载雷达高度计绝对定标中的应用

推导了一般情况下激光站为星载雷达高度计进行绝对定标的数学模型,并进行了仿真验证和误差分析,对高度计定标精度进行了定量评估。利用Corsica定标场区中Grasse激光站对Jason-2卫星定轨的实测数据进行了分析,取得了满意的结果。     

移动设备外业调绘系统研制

随着移动设备的发展使得外业调绘野外作业数字化作业变为可能。通过分析外业调绘的作业方式、要求,探索移动设备性能,研制了基于移动设备野外调绘的系统。     

使用电子调绘系统的内外业一体化作业方法

结合航测调绘作业的实际情况,提出了一种以数字化的电子调绘系统为基础,紧密结谷数字移动设备的新的调绘作业方式。一种内外业工作相辅相成,紧密合作的工作方式。达到了新时期提高外业调绘作业效率,降低外业劳动强度的要求,实现地理数据快速更新和内外业工作的一体化。     

PDA环境下面状地物动态注记的研究与实现

提出了在PDA环境下,电子地图可视化过程中,面状地物动态注记的一种实现方法。其中,对在PDA环境下如何选择多边形裁剪算法和面状地物注记配置算法进行了简要分析,着重提出了面积加权计算多边形形心来配置注记的算法。     

A Rule-Based Strategy for the Semantic Annotation of Geodata

The ability to represent geospatial semantics is of great importance when building geospatial applications for the Web. This ability will enhance discovery, retrieval and translation of geographic information as well as the reuse of geographic information in different contexts. The problem of generating semantic annotations has been recognized as one of the most serious obstacles for realizing the Geospatial Semantic Web vision. We present a rule‐based strategy for the semantic annotation of geodata that combines Semantic Web and Geospatial Web Services technology. In our approach, rules are employed to partially automate the annotation process. Rules define conditions for identifying geospatial concepts. Based on these rules, spatial analysis procedures are implemented that allow for inferring whether or not a feature in a dataset represents an instance of a geospatial concept. This automated evaluation of features in the dataset generates valuable information for the creation and refinement of semantic annotations on the concept level. The approach is illustrated by a case study on annotating data sources containing representations of lowlands. The presented strategy lays the foundations for the specification of a semantic annotation tool for geospatial web services that supports data providers in annotating their sources according to multiple domain views.     

基本农田土地整理项目的内业数字化处理

基本农田土地整理项目是振兴东北老工业基地重点项目之一。从早期土地利用现状图开始,通过全数字化处理手段和软件的二次开发,阐述了全数字化内业处理的可行性和优越性,介绍了一种新的基本农田土地整理项目现状图内业处理方法,以及土地利用分类面积汇总技巧和现状图标注面积与土地利用分类地块统计面积相对应检查手段。     

结合对抗网络与辅助任务的遥感影像无监督域适应方法

使用机器学习进行遥感影像标注的一个重要前提是有足够的训练样本,而样本的标注是非常耗时的。本文采用了域适应的方法来解决遥感影像场景分类中小样本量的无监督学习问题,提出了结合对抗网络与辅助任务的遥感影像域适应方法。首先建立了基于深度卷积神经网络的遥感影像分类框架;其次,为了学习到域不变特征,在标签分类器的基础上增加域分类器,并使域损失函数在其反射传播时的梯度与标签损失的梯度相反,从而保证域分类器不能区分样本来自于哪个域;最后引入了辅助分类任务,扩充了样本的同时使网络更具泛化能力。试验结果表明,本文方法优于主流的无监督域适应方法,在小样本遥感影像无监督分类中得到了较好的效果。     

Detection of Mesoscale Eddy-Related Structures Through Iso-SST Patterns

This letter, addressed to the analysis of remote sensing (RS) images of the sea-surface temperature (SST) off the Portugal coast, presents a novel approach to automatically detect and characterize mesoscale eddy-related structures. The complexity of this task is due to the dynamics of the investigated region, where upwelling currents and bathymetry effects produce countless and highly heterogeneous SST patterns, features of interest may have smooth boundaries, and edges associated to strong temperature gradients may not correspond to any eddy. All these limit the effectiveness of an image processing based on edge features (which can be successfully applied to automatically detect eddies in other oceanographic areas, for instance, close to the Gulf Stream). The proposed scheme exploits the iso-SST patterns associated to the eddy-related structure to code with a rule-based definition the process that allows for their visual identification. In practice, this enables revealing various morphological parameters of the eddy-related structure (i.e., the location, scale, symmetry, and rotation) and supports the exploitation of SST data allowing for annotating the RS image and benchmarking the subjectivity of the visual survey.     

Specialist Maps Prepared by German Military Geologists for Operation Sealion: the Invasion of England Scheduled for September 1940

Abstract

During the Second World War, the German army developed the largest organization of any nation ever to contribute military applications of earth science in wartime. In the summer of 1940, its military geologists assisted planning for potentially the greatest amphibious assault to that time in history by preparing maps which analysed the terrain of southeast England in terms of coastal geomorphology, groundwater supply, quarry sites for construction materials and off-road trafficability. These specialist maps were generated at scales of 1:50 000, 1:100 000 or 1:250 000 by annotating topographical base maps, derived from the then current Ordnance Survey maps at most similar scale, with data derived from maps and memoirs published by the Geological Survey of Great Britain or larger-scale Ordnance Survey maps. They represent an early example of geotechnical mapping skills developed more fully in the German armed forces for operations elsewhere later in the war.     

Loose programming of GIS workflows with geo‐analytical concepts

Loose programming enables analysts to program with concepts instead of procedural code. Data transformations are left underspecified, leaving out procedural details and exploiting knowledge about the applicability of functions to data types. To synthesize workflows of high quality for a geo‐analytical task, the semantic type system needs to reflect knowledge of geographic information systems (GIS) at a level that is deep enough to capture geo‐analytical concepts and intentions, yet shallow enough to generalize over GIS implementations. Recently, core concepts of spatial information and related geo‐analytical concepts were proposed as a way to add the required abstraction level to current geodata models. The core concept data types (CCD) ontology is a semantic type system that can be used to constrain GIS functions for workflow synthesis. However, to date, it is unknown what gain in precision and workflow quality can be expected. In this article we synthesize workflows by annotating GIS tools with these types, specifying a range of common analytical tasks taken from an urban livability scenario. We measure the quality of automatically synthesized workflows against a benchmark generated from common data types. Results show that CCD concepts significantly improve the precision of workflow synthesis.